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[Emacs-diffs] Changes to intro.texi


From: Glenn Morris
Subject: [Emacs-diffs] Changes to intro.texi
Date: Thu, 06 Sep 2007 04:12:06 +0000

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Glenn Morris <gm>       07/09/06 04:12:06

Index: intro.texi
===================================================================
RCS file: intro.texi
diff -N intro.texi
--- intro.texi  13 Aug 2007 13:41:21 -0000      1.39
+++ /dev/null   1 Jan 1970 00:00:00 -0000
@@ -1,560 +0,0 @@
address@hidden -*-texinfo-*-
address@hidden This is part of the GNU Emacs Lisp Reference Manual.
address@hidden Copyright (C) 1990, 1991, 1992, 1993, 1994, 2001, 2002, 2003, 
2004,
address@hidden   2005, 2006, 2007  Free Software Foundation, Inc.
address@hidden See the file elisp.texi for copying conditions.
address@hidden ../info/intro
-
address@hidden Introduction, Lisp Data Types, Top, Top
address@hidden  node-name,  next,  previous,  up
address@hidden Introduction
-
-  Most of the GNU Emacs text editor is written in the programming
-language called Emacs Lisp.  You can write new code in Emacs Lisp and
-install it as an extension to the editor.  However, Emacs Lisp is more
-than a mere ``extension language''; it is a full computer programming
-language in its own right.  You can use it as you would any other
-programming language.
-
-  Because Emacs Lisp is designed for use in an editor, it has special
-features for scanning and parsing text as well as features for handling
-files, buffers, displays, subprocesses, and so on.  Emacs Lisp is
-closely integrated with the editing facilities; thus, editing commands
-are functions that can also conveniently be called from Lisp programs,
-and parameters for customization are ordinary Lisp variables.
-
-  This manual attempts to be a full description of Emacs Lisp.  For a
-beginner's introduction to Emacs Lisp, see @cite{An Introduction to
-Emacs Lisp Programming}, by Bob Chassell, also published by the Free
-Software Foundation.  This manual presumes considerable familiarity with
-the use of Emacs for editing; see @cite{The GNU Emacs Manual} for this
-basic information.
-
-  Generally speaking, the earlier chapters describe features of Emacs
-Lisp that have counterparts in many programming languages, and later
-chapters describe features that are peculiar to Emacs Lisp or relate
-specifically to editing.
-
-  This is edition @value{VERSION} of the GNU Emacs Lisp Reference
-Manual, corresponding to Emacs version @value{EMACSVER}.
-
address@hidden
-* Caveats::             Flaws and a request for help.
-* Lisp History::        Emacs Lisp is descended from Maclisp.
-* Conventions::         How the manual is formatted.
-* Version Info::        Which Emacs version is running?
-* Acknowledgements::    The authors, editors, and sponsors of this manual.
address@hidden menu
-
address@hidden Caveats
address@hidden Caveats
address@hidden bugs in this manual
-
-  This manual has gone through numerous drafts.  It is nearly complete
-but not flawless.  There are a few topics that are not covered, either
-because we consider them secondary (such as most of the individual
-modes) or because they are yet to be written.  Because we are not able
-to deal with them completely, we have left out several parts
-intentionally.  This includes most information about usage on VMS.
-
-  The manual should be fully correct in what it does cover, and it is
-therefore open to criticism on anything it says---from specific examples
-and descriptive text, to the ordering of chapters and sections.  If
-something is confusing, or you find that you have to look at the sources
-or experiment to learn something not covered in the manual, then perhaps
-the manual should be fixed.  Please let us know.
-
address@hidden
-  As you use this manual, we ask that you mark pages with corrections so
-you can later look them up and send them to us.  If you think of a simple,
-real-life example for a function or group of functions, please make an
-effort to write it up and send it in.  Please reference any comments to
-the chapter name, section name, and function name, as appropriate, since
-page numbers and chapter and section numbers will change and we may have
-trouble finding the text you are talking about.  Also state the number
-of the edition you are criticizing.
address@hidden iftex
address@hidden
-
-As you use this manual, we ask that you send corrections as soon as you
-find them.  If you think of a simple, real life example for a function
-or group of functions, please make an effort to write it up and send it
-in.  Please reference any comments to the node name and function or
-variable name, as appropriate.  Also state the number of the edition
-you are criticizing.
address@hidden ifnottex
-
address@hidden bugs
address@hidden suggestions
-Please mail comments and corrections to
-
address@hidden
-bug-lisp-manual@@gnu.org
address@hidden example
-
address@hidden
-We let mail to this list accumulate unread until someone decides to
-apply the corrections.  Months, and sometimes years, go by between
-updates.  So please attach no significance to the lack of a reply---your
-mail @emph{will} be acted on in due time.  If you want to contact the
-Emacs maintainers more quickly, send mail to
address@hidden@@gnu.org}.
-
address@hidden Lisp History
address@hidden Lisp History
address@hidden Lisp history
-
-  Lisp (LISt Processing language) was first developed in the late 1950s
-at the Massachusetts Institute of Technology for research in artificial
-intelligence.  The great power of the Lisp language makes it ideal
-for other purposes as well, such as writing editing commands.
-
address@hidden Maclisp
address@hidden Common Lisp
-  Dozens of Lisp implementations have been built over the years, each
-with its own idiosyncrasies.  Many of them were inspired by Maclisp,
-which was written in the 1960s at MIT's Project MAC.  Eventually the
-implementors of the descendants of Maclisp came together and developed a
-standard for Lisp systems, called Common Lisp.  In the meantime, Gerry
-Sussman and Guy Steele at MIT developed a simplified but very powerful
-dialect of Lisp, called Scheme.
-
-  GNU Emacs Lisp is largely inspired by Maclisp, and a little by Common
-Lisp.  If you know Common Lisp, you will notice many similarities.
-However, many features of Common Lisp have been omitted or
-simplified in order to reduce the memory requirements of GNU Emacs.
-Sometimes the simplifications are so drastic that a Common Lisp user
-might be very confused.  We will occasionally point out how GNU Emacs
-Lisp differs from Common Lisp.  If you don't know Common Lisp, don't
-worry about it; this manual is self-contained.
-
address@hidden cl
-  A certain amount of Common Lisp emulation is available via the
address@hidden library.  @inforef{Top, Overview, cl}.
-
-  Emacs Lisp is not at all influenced by Scheme; but the GNU project has
-an implementation of Scheme, called Guile.  We use Guile in all new GNU
-software that calls for extensibility.
-
address@hidden Conventions
address@hidden Conventions
-
-This section explains the notational conventions that are used in this
-manual.  You may want to skip this section and refer back to it later.
-
address@hidden
-* Some Terms::               Explanation of terms we use in this manual.
-* nil and t::                How the symbols @code{nil} and @code{t} are used.
-* Evaluation Notation::      The format we use for examples of evaluation.
-* Printing Notation::        The format we use when examples print text.
-* Error Messages::           The format we use for examples of errors.
-* Buffer Text Notation::     The format we use for buffer contents in examples.
-* Format of Descriptions::   Notation for describing functions, variables, etc.
address@hidden menu
-
address@hidden Some Terms
address@hidden Some Terms
-
-  Throughout this manual, the phrases ``the Lisp reader'' and ``the Lisp
-printer'' refer to those routines in Lisp that convert textual
-representations of Lisp objects into actual Lisp objects, and vice
-versa.  @xref{Printed Representation}, for more details.  You, the
-person reading this manual, are thought of as ``the programmer'' and are
-addressed as ``you.''  ``The user'' is the person who uses Lisp
-programs, including those you write.
-
address@hidden fonts in this manual
-  Examples of Lisp code are formatted like this: @code{(list 1 2 3)}.
-Names that represent metasyntactic variables, or arguments to a function
-being described, are formatted like this: @var{first-number}.
-
address@hidden nil and t
address@hidden @code{nil} and @code{t}
address@hidden truth value
address@hidden boolean
-
address@hidden @code{nil}
address@hidden false
-  In Lisp, the symbol @code{nil} has three separate meanings: it
-is a symbol with the name @samp{nil}; it is the logical truth value
address@hidden; and it is the empty list---the list of zero elements.
-When used as a variable, @code{nil} always has the value @code{nil}.
-
-  As far as the Lisp reader is concerned, @samp{()} and @samp{nil} are
-identical: they stand for the same object, the symbol @code{nil}.  The
-different ways of writing the symbol are intended entirely for human
-readers.  After the Lisp reader has read either @samp{()} or @samp{nil},
-there is no way to determine which representation was actually written
-by the programmer.
-
-  In this manual, we write @code{()} when we wish to emphasize that it
-means the empty list, and we write @code{nil} when we wish to emphasize
-that it means the truth value @var{false}.  That is a good convention to use
-in Lisp programs also.
-
address@hidden
-(cons 'foo ())                ; @r{Emphasize the empty list}
-(setq foo-flag nil)           ; @r{Emphasize the truth value @var{false}}
address@hidden example
-
address@hidden @code{t}
address@hidden true
-  In contexts where a truth value is expected, any address@hidden value
-is considered to be @var{true}.  However, @code{t} is the preferred way
-to represent the truth value @var{true}.  When you need to choose a
-value which represents @var{true}, and there is no other basis for
-choosing, use @code{t}.  The symbol @code{t} always has the value
address@hidden
-
-  In Emacs Lisp, @code{nil} and @code{t} are special symbols that always
-evaluate to themselves.  This is so that you do not need to quote them
-to use them as constants in a program.  An attempt to change their
-values results in a @code{setting-constant} error.  @xref{Constant
-Variables}.
-
address@hidden booleanp object
-Return non-nil if @var{object} is one of the two canonical boolean
-values: @code{t} or @code{nil}.
address@hidden defun
-
address@hidden Evaluation Notation
address@hidden Evaluation Notation
address@hidden evaluation notation
address@hidden documentation notation
address@hidden notation
-
-  A Lisp expression that you can evaluate is called a @dfn{form}.
-Evaluating a form always produces a result, which is a Lisp object.  In
-the examples in this manual, this is indicated with @address@hidden:
-
address@hidden
-(car '(1 2))
-     @result{} 1
address@hidden example
-
address@hidden
-You can read this as address@hidden(car '(1 2))} evaluates to 1.''
-
-  When a form is a macro call, it expands into a new form for Lisp to
-evaluate.  We show the result of the expansion with
address@hidden@expansion{}}.  We may or may not show the result of the
-evaluation of the expanded form.
-
address@hidden
-(third '(a b c))
-     @expansion{} (car (cdr (cdr '(a b c))))
-     @result{} c
address@hidden example
-
-  Sometimes to help describe one form we show another form that
-produces identical results.  The exact equivalence of two forms is
-indicated with @address@hidden
-
address@hidden
-(make-sparse-keymap) @equiv{} (list 'keymap)
address@hidden example
-
address@hidden Printing Notation
address@hidden Printing Notation
address@hidden printing notation
-
-  Many of the examples in this manual print text when they are
-evaluated.  If you execute example code in a Lisp Interaction buffer
-(such as the buffer @samp{*scratch*}), the printed text is inserted into
-the buffer.  If you execute the example by other means (such as by
-evaluating the function @code{eval-region}), the printed text is
-displayed in the echo area.
-
-  Examples in this manual indicate printed text with @address@hidden,
-irrespective of where that text goes.  The value returned by
-evaluating the form (here @code{bar}) follows on a separate line with
address@hidden@result{}}.
-
address@hidden
address@hidden
-(progn (prin1 'foo) (princ "\n") (prin1 'bar))
-     @print{} foo
-     @print{} bar
-     @result{} bar
address@hidden group
address@hidden example
-
address@hidden Error Messages
address@hidden Error Messages
address@hidden error message notation
-
-  Some examples signal errors.  This normally displays an error message
-in the echo area.  We show the error message on a line starting with
address@hidden@error{}}.  Note that @address@hidden itself does not appear in
-the echo area.
-
address@hidden
-(+ 23 'x)
address@hidden Wrong type argument: number-or-marker-p, x
address@hidden example
-
address@hidden Buffer Text Notation
address@hidden Buffer Text Notation
address@hidden buffer text notation
-
-  Some examples describe modifications to the contents of a buffer, by
-showing the ``before'' and ``after'' versions of the text.  These
-examples show the contents of the buffer in question between two lines
-of dashes containing the buffer name.  In addition, @address@hidden
-indicates the location of point.  (The symbol for point, of course, is
-not part of the text in the buffer; it indicates the place
address@hidden two characters where point is currently located.)
-
address@hidden
----------- Buffer: foo ----------
-This is the @point{}contents of foo.
----------- Buffer: foo ----------
-
-(insert "changed ")
-     @result{} nil
----------- Buffer: foo ----------
-This is the changed @point{}contents of foo.
----------- Buffer: foo ----------
address@hidden example
-
address@hidden Format of Descriptions
address@hidden Format of Descriptions
address@hidden description format
-
-  Functions, variables, macros, commands, user options, and special
-forms are described in this manual in a uniform format.  The first
-line of a description contains the name of the item followed by its
-arguments, if any.
address@hidden
-The category---function, variable, or whatever---appears at the
-beginning of the line.
address@hidden ifnottex
address@hidden
-The category---function, variable, or whatever---is printed next to the
-right margin.
address@hidden iftex
-The description follows on succeeding lines, sometimes with examples.
-
address@hidden
-* A Sample Function Description::       A description of an imaginary
-                                          function, @code{foo}.
-* A Sample Variable Description::       A description of an imaginary
-                                          variable,
-                                          @code{electric-future-map}.
address@hidden menu
-
address@hidden A Sample Function Description
address@hidden A Sample Function Description
address@hidden function descriptions
address@hidden command descriptions
address@hidden macro descriptions
address@hidden special form descriptions
-
-  In a function description, the name of the function being described
-appears first.  It is followed on the same line by a list of argument
-names.  These names are also used in the body of the description, to
-stand for the values of the arguments.
-
-  The appearance of the keyword @code{&optional} in the argument list
-indicates that the subsequent arguments may be omitted (omitted
-arguments default to @code{nil}).  Do not write @code{&optional} when
-you call the function.
-
-  The keyword @code{&rest} (which must be followed by a single
-argument name) indicates that any number of arguments can follow.  The
-single argument name following @code{&rest} will receive, as its
-value, a list of all the remaining arguments passed to the function.
-Do not write @code{&rest} when you call the function.
-
-  Here is a description of an imaginary function @code{foo}:
-
address@hidden foo integer1 &optional integer2 &rest integers
-The function @code{foo} subtracts @var{integer1} from @var{integer2},
-then adds all the rest of the arguments to the result.  If @var{integer2}
-is not supplied, then the number 19 is used by default.
-
address@hidden
-(foo 1 5 3 9)
-     @result{} 16
-(foo 5)
-     @result{} 14
address@hidden example
-
address@hidden 1500
-More generally,
-
address@hidden
-(foo @var{w} @var{x} @address@hidden)
address@hidden
-(+ (- @var{x} @var{w}) @address@hidden)
address@hidden example
address@hidden defun
-
-  Any argument whose name contains the name of a type (e.g.,
address@hidden, @var{integer1} or @var{buffer}) is expected to be of that
-type.  A plural of a type (such as @var{buffers}) often means a list of
-objects of that type.  Arguments named @var{object} may be of any type.
-(@xref{Lisp Data Types}, for a list of Emacs object types.)  Arguments
-with other sorts of names (e.g., @var{new-file}) are discussed
-specifically in the description of the function.  In some sections,
-features common to the arguments of several functions are described at
-the beginning.
-
-  @xref{Lambda Expressions}, for a more complete description of optional
-and rest arguments.
-
-  Command, macro, and special form descriptions have the same format,
-but the word `Function' is replaced by `Command', `Macro', or `Special
-Form', respectively.  Commands are simply functions that may be called
-interactively; macros process their arguments differently from functions
-(the arguments are not evaluated), but are presented the same way.
-
-  Special form descriptions use a more complex notation to specify
-optional and repeated arguments because they can break the argument
-list down into separate arguments in more complicated ways.
address@hidden@address@hidden@r{]}} means that @var{optional-arg} is
-optional and @address@hidden@dots{}} stands for zero or more
-arguments.  Parentheses are used when several arguments are grouped into
-additional levels of list structure.  Here is an example:
-
address@hidden count-loop (@var{var} address@hidden @var{to} address@hidden) 
@address@hidden
-This imaginary special form implements a loop that executes the
address@hidden forms and then increments the variable @var{var} on each
-iteration.  On the first iteration, the variable has the value
address@hidden; on subsequent iterations, it is incremented by one (or by
address@hidden if that is given).  The loop exits before executing @var{body}
-if @var{var} equals @var{to}.  Here is an example:
-
address@hidden
-(count-loop (i 0 10)
-  (prin1 i) (princ " ")
-  (prin1 (aref vector i))
-  (terpri))
address@hidden example
-
-If @var{from} and @var{to} are omitted, @var{var} is bound to
address@hidden before the loop begins, and the loop exits if @var{var} is
address@hidden at the beginning of an iteration.  Here is an example:
-
address@hidden
-(count-loop (done)
-  (if (pending)
-      (fixit)
-    (setq done t)))
address@hidden example
-
-In this special form, the arguments @var{from} and @var{to} are
-optional, but must both be present or both absent.  If they are present,
address@hidden may optionally be specified as well.  These arguments are
-grouped with the argument @var{var} into a list, to distinguish them
-from @var{body}, which includes all remaining elements of the form.
address@hidden defspec
-
address@hidden A Sample Variable Description
address@hidden A Sample Variable Description
address@hidden variable descriptions
address@hidden option descriptions
-
-  A @dfn{variable} is a name that can hold a value.  Although nearly
-all variables can be set by the user, certain variables exist
-specifically so that users can change them; these are called @dfn{user
-options}.  Ordinary variables and user options are described using a
-format like that for functions except that there are no arguments.
-
-  Here is a description of the imaginary @code{electric-future-map}
address@hidden
-
address@hidden electric-future-map
-The value of this variable is a full keymap used by Electric Command
-Future mode.  The functions in this map allow you to edit commands you
-have not yet thought about executing.
address@hidden defvar
-
-  User option descriptions have the same format, but `Variable' is
-replaced by `User Option'.
-
address@hidden Version Info
address@hidden Version Information
-
-  These facilities provide information about which version of Emacs is
-in use.
-
address@hidden Command emacs-version &optional here
-This function returns a string describing the version of Emacs that is
-running.  It is useful to include this string in bug reports.
-
address@hidden
address@hidden
-(emacs-version)
-  @result{} "GNU Emacs 20.3.5 (i486-pc-linux-gnulibc1, X toolkit)
- of Sat Feb 14 1998 on psilocin.gnu.org"
address@hidden group
address@hidden smallexample
-
-If @var{here} is address@hidden, it inserts the text in the buffer
-before point, and returns @code{nil}.  Called interactively, the
-function prints the same information in the echo area, but giving a
-prefix argument makes @var{here} address@hidden
address@hidden deffn
-
address@hidden emacs-build-time
-The value of this variable indicates the time at which Emacs was built
-at the local site.  It is a list of three integers, like the value
-of @code{current-time} (@pxref{Time of Day}).
-
address@hidden
address@hidden
-emacs-build-time
-     @result{} (13623 62065 344633)
address@hidden group
address@hidden example
address@hidden defvar
-
address@hidden emacs-version
-The value of this variable is the version of Emacs being run.  It is a
-string such as @code{"20.3.1"}.  The last number in this string is not
-really part of the Emacs release version number; it is incremented each
-time you build Emacs in any given directory.  A value with four numeric
-components, such as @code{"20.3.9.1"}, indicates an unreleased test
-version.
address@hidden defvar
-
-  The following two variables have existed since Emacs version 19.23:
-
address@hidden emacs-major-version
-The major version number of Emacs, as an integer.  For Emacs version
-20.3, the value is 20.
address@hidden defvar
-
address@hidden emacs-minor-version
-The minor version number of Emacs, as an integer.  For Emacs version
-20.3, the value is 3.
address@hidden defvar
-
address@hidden Acknowledgements
address@hidden Acknowledgements
-
-  This manual was written by Robert Krawitz, Bil Lewis, Dan LaLiberte,
address@hidden Stallman and Chris Welty, the volunteers of the GNU
-manual group, in an effort extending over several years.
address@hidden Chassell helped to review and edit the manual, with the
-support of the Defense Advanced Research Projects Agency, ARPA Order
-6082, arranged by address@hidden Hunt, Jr.@: of Computational Logic,
-Inc.
-
-  Corrections were supplied by Karl Berry, Jim Blandy, Bard Bloom,
-Stephane Boucher, David Boyes, Alan Carroll, Richard Davis, Lawrence
-R. Dodd, Peter Doornbosch, David A. Duff, Chris Eich, Beverly
-Erlebacher, David Eckelkamp, Ralf Fassel, Eirik Fuller, Stephen Gildea,
-Bob Glickstein, Eric Hanchrow, George Hartzell, Nathan Hess, Masayuki
-Ida, Dan Jacobson, Jak Kirman, Bob Knighten, Frederick M. Korz, Joe
-Lammens, Glenn M. Lewis, K. Richard Magill, Brian Marick, Roland
-McGrath, Skip Montanaro, John Gardiner Myers, Thomas A. Peterson,
-Francesco Potorti, Friedrich Pukelsheim, Arnold D. Robbins, Raul
-Rockwell, Per Starb@"ack, Shinichirou Sugou, Kimmo Suominen, Edward Tharp,
-Bill Trost, Rickard Westman, Jean White, Matthew Wilding, Carl Witty,
-Dale Worley, Rusty Wright, and David D. Zuhn.
-
address@hidden
-   arch-tag: d156593f-82f8-4708-a844-204e48f7f2aa
address@hidden ignore




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